Rumble it’s always like that. YouTube has the same problem SOMETIMES but it flickers for like 1 second and goes back to normal. Always with the green diagonal line and then the other stuff distorted in the same manner.
If I click pause on a YouTube video it STILL flickers into that every 10 seconds or so (only for about 1 second)
I have been having the same problems within last few days on embedded YouTube videos and Twitter videos as well as Rumble. Often notice if I hover my mouse off the video in a news article, the video will play correctly.